In modern industrial thermal engineering, hot water boilers, hydronic heating loops, and commercial steam generators require real-time monitoring of two primary physical variables: fluid temperature and systemic hydrostatic pressure. A combined CE Certification Hot Water Boiler Temperature Pressure Gauge (commonly referred to in European engineering standard EN 837-1 / EN 13190 as a Thermomanometer) serves as the primary mechanical safety valve for plant operators, providing fail-safe visual diagnostic redundant telemetry without relying on external electrical supply.
The mechanical design integrates two independent sensing elements into a unified brass or stainless-steel process connection stem (typically 1/2" NPT, 1/4" NPT, or G1/2 BSP). Pressure detection is realized via a precision-formed C-type Bourdon tube or phosphor bronze diaphragm capsule. Simultaneously, temperature measurement utilizes a spirally coiled bimetallic strip or an organic liquid capillary bulb housed inside a protective immersion stem.
Manufactured from seamless AISI 316L stainless steel or beryllium copper. Engineered to endure over 100,000 continuous pressure cycles without elastic deformation or zero-shift error.
Formed through high-precision heat-treatment of two metals with contrasting expansion coefficients. Delivers linear dial displacement across 0°C to 120°C (32°F to 250°F) range.
Equipped with automatic internal check valves within the immersion pocket, enabling gauge replacement without needing to drain or depressurize the boiler water loop.
Huzhou Accuracy Instrument Co., Ltd. stands as a premier global manufacturer specializing in industrial mechanical pressure gauges, bimetal thermometers, SF6 gas density monitors, and microfused pressure sensors. Backed by over 20 years of experience and continuous research, our operations span a state-of-the-art 3,000 square meter facility engineered under Industry 4.0 standards.
Our integrated factory infrastructure addresses the global procurement need for cost-efficient, high-volume production without compromising on sub-millimeter manufacturing tolerances. By combining automated CNC machining, robotized laser welding, and automated pressure testing rigs, we maintain an annual output exceeding 2 million precision units exported to over 30 countries across Europe, North America, Southeast Asia, and the Middle East.
Dedicated to material innovation, finite element analysis (FEA) of pressure diaphragms, smart sensor integration (4-20mA / HART), and strictly aligning product blueprints with ISO, API, and EN standardizations.
Utilizing zero-leak laser welding lines, automatic dial printing, and multi-point calibration. Every single hot water gauge undergoes 100% full-scale pressure and thermal cycling tests prior to packaging.
Offering 24/7 technical consultation, custom thread engineering, tailored scale graphics (Psi, Bar, kPa, °C, °F), and rapid OEM/ODM prototype delivery within accelerated turnarounds.
We strictly follow the business core concept of "Reasonable Price, Accurate Delivery, High Quality". Operating under an ISO 9001:2008 / ISO 9001:2015 certified quality framework, our laboratory adheres to ISO 17025 calibration protocol.
Select the ideal configuration for your hydronic boiler system, steam generator, or industrial process loop using our technical parameter matrix below:
| Parameter | Standard Specification | Industrial High-Spec Option |
|---|---|---|
| Dial Diameters | 63 mm (2.5"), 80 mm (3.0") | 100 mm (4.0"), 150 mm (6.0") |
| Pressure Scale Ranges | 0 to 4 bar, 0 to 6 bar, 0 to 10 bar (0–1 MPa) | Custom Dual Scale (0–100 PSI / 0–700 kPa / 0–140 Bar) |
| Temperature Ranges | 0°C to 120°C / 32°F to 250°F | -40°C to +200°C High-Temp Capillary Stem |
| Accuracy Class | Class 1.6 / Class 2.5 (EN 837-1) | Class 1.0 High Precision (EN 13190) / ±0.5% FS |
| Case Material | Black Steel (Powder Coated), Chrome Plated Steel | AISI 304 / AISI 316 Stainless Steel (IP65 / IP67) |
| Wetted Parts & Stem | Copper Alloy / OT58 Brass (Up to 120°C) | Laser-Welded AISI 316L SS / Monel / Diaphragm Sealed |
| Process Connection | 1/4" NPT, 1/2" NPT, G1/4", G1/2", M20x1.5 | Flanged Diaphragm, Tri-Clamp Sanitary, Capillary Remote Mount |
| Dampening Fluid | Dry (Standard) | Glycerin (up to 65°C), High-Temp Silicone Oil (up to 200°C) |
| Certifications & Marks | CE Mark, PED 2014/68/EU Directive | ISO 9001:2015, SGS Report, RoHS, ATEX Electric Contact |
Boiler safety standards vary significantly based on operational environment, local building codes, and thermal medium composition. Huzhou Accuracy Instrument provides specialized engineering solutions tailored to four core industry verticals:
Central heating boilers require continuous monitoring of hot water supply and return loops. Our dual-scale thermomanometers provide maintenance technicians with instantaneous differential pressure and temperature readings. Outfitted with automatic shut-off check valves, these units allow rapid maintenance without interrupting heating services to entire residential blocks during winter seasons.
For boilers operating in hazardous areas containing combustible vapors, our OEM Explosion-Proof Electric Contact Bimetal Thermometers and 2088/3051 Transmitters provide flameproof enclosures (ATEX/IECEx compliant). Integrated magnetic snap-action or inductive electric contacts trigger automated alarms or shut down fuel supply pumps when internal pressure/temperature exceeds critical thresholds.
Beyond water boilers, high-voltage equipment and heavy hydraulic power packs experience intense vibration and extreme pressure dynamics. Our SF6 Gas Density Monitors (63mm dial) and glass microfused pressure sensors deliver high accuracy (0.5% FS) and temperature-compensated gas density tracking to prevent catastrophic insulation flashovers in electrical switchgear.
Sanitary steam heating systems used in food cooking kettles or pharmaceutical autoclaves demand corrosion-resistant, zero-dead-leg design. We provide laser-welded diaphragm seal pressure gauges made of food-grade AISI 316L stainless steel, complete with quick-connect Tri-Clamp fittings and electropolished interior surfaces to facilitate CIP (Clean-in-Place) and SIP (Sterilize-in-Place) procedures.
As the global energy transition accelerates towards low-carbon heating, boiler instrumentation is undergoing a rapid evolution. The future of thermo-hydraulic monitoring lies in blending proven mechanical safety redundancies with digital Intelligence (IIoT).
Integrating micro-power optical encoders onto traditional Bourdon mechanical shafts. This provides localized dial visibility during power outages while simultaneously transmitting 4-20mA or RS485 Modbus RTU telemetry to centralized Building Management Systems (BMS).
With hydrogen blending taking hold in green heating networks, zero-permeation diaphragms and specialized anti-embrittlement alloys (such as Hastelloy C-276 and gold-plated diaphragms) are being engineered to prevent hydrogen gas migration into pointer mechanisms.
Embedded micro-sensors inside pressure gauges tracking pressure cycles, thermal over-exposure, and structural fatigue. Edge computing algorithms evaluate pointer movement to alert operators of impending boiler pump failures before cataclysmic leaks occur.
Navigating international boiler safety regulations requires strict adherence to regional standardizations. Huzhou Accuracy Instrument provides comprehensive global compliance documentation to streamline customs clearance, safety audits, and project commissioning.
Our hot water boiler gauges fully comply with the European Union Pressure Equipment Directive (PED 2014/68/EU). Each order is supported by official CE Conformity Declarations and EN 10204 3.1 Material Traceability Certificates upon request.
We offer multi-language dial face printing, custom corporate branding logos, color-coded temperature/pressure zone indicators (Red/Yellow/Green safety bands), and dual scale units tailored to target markets (PSI/Bar/kPa/°C/°F).
Flexible order quantities, customized protective blister or individual box packaging, barcode labeling, and expedited air/sea freight logistics supporting DDP, FOB, and CIF terms directly to global OEM boiler manufacturers.
Accuracy Instrument
